I want to query features under [Layer Properties] -> [Source] -> [Query Builder] but the query builder button is greyed out. The layer I'm using is from a shapefile with multiple demographic fields by US county. I'm using QGIS 3.16.

  • Welcome to GIS SE ! Please post your solution as answer (you can answer at your own questions) (you can even delete your question but maybe it helps other people). – J. Monticolo Feb 14 at 17:53

I must have made an error while familiarizing myself with QGIS. I removed the layer then re-added it and I'm able to Query it's features now.

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